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Date: Sat, 9 Sep 2006 11:04:49 +0200
From: thunder7@xs4all.nl
To: Andrew Morton <akpm@osdl.org>
Cc: Jurriaan <thunder7@xs4all.nl>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.18-rc6-mm1
Message-ID: <20060909090449.GA16579@amd64.of.nowhere>
Reply-To: Jurriaan <thunder7@xs4all.nl>
References: <20060908011317.6cb0495a.akpm@osdl.org> <20060908193041.GA18966@amd64.of.nowhere> <20060908124411.aa96fb7b.akpm@osdl.org>
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From: Andrew Morton <akpm@osdl.org>
Date: Fri, Sep 08, 2006 at 12:44:11PM -0700
> On Fri, 8 Sep 2006 21:30:41 +0200
> thunder7@xs4all.nl wrote:
> 
> > From: Andrew Morton <akpm@osdl.org>
> > Date: Fri, Sep 08, 2006 at 01:13:17AM -0700
> > > 
> > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm1/
> > > 
> > This throws an oops on my IBM Thinkpad T23 notebook. Some parts scroll
> > off the screen, but the visible stack trace goes like this:
> > 
> We'd really need to see that trace, please.  netconsole is worth setting
> up, if you have another machine on the LAN.
> 
Well, I've learned that built-in framebuffers initialize _before_ the
network stack is up, so that didn't help. Rebuilding savagefb as a
module gave me:

hub 3-0:1.0: 2 ports detected
savagefb: mapped io at f8980000
savagefb: probed videoram:  16384k
savagefb: Detected current MCLK value of 71591 kHz
savagefb: 1024x768 TFT LCD panel detected and active
savagefb: Limiting video mode to 1024x768
savagefb: mapped framebuffer at f8a80000, pbase == e8000000
BUG: unable to handle kernel NULL pointer dereference at virtual address
00000000
 printing eip:
 f8831013
 *pde = 00000000
 Oops: 0000 [#1]
 4K_STACKS PREEMPT 
 last sysfs file: /devices/system/cpu/cpu0/cpufreq/scaling_governor
 Modules linked in: savagefb fb_ddc cfbimgblt uhci_hcd usbcore
 CPU:    0
 EIP:    0060:[<f8831013>]    Not tainted VLI
 EFLAGS: 00010286   (2.6.18-rc6-mm1 #6) 
 EIP is at fb_ddc_read+0x13/0x1c4 [fb_ddc]
 eax: f7faf250   ebx: 00000000   ecx: f7faf244   edx: f7faf244
 esi: 00000000   edi: f7faf008   ebp: f7fbed98   esp: f7fbed68
 ds: 007b   es: 007b   ss: 0068
 Process modprobe (pid: 1776, ti=f7fbe000 task=f7fbdab0
 task.ti=f7fbe000)
 Stack: 00000001 f7faf244 00004988 01000000 f7faf000 f9a6d9e0 f7fbede8 00000000 
        f7faf244 f7faf208 f7faf000 f7faf008 f7fbedb0 f8846af9 f7faf250 f7faf208 
        f7faf000 f7faf008 f7fbede8 f884667c f7faf000 f7faf6b0 f7fbedd0 c01ebe91 
 Call Trace:
 [<c01039eb>] show_trace_log_lvl+0x15/0x28
 [<c0103a8a>] show_stack_log_lvl+0x8c/0x97
 [<c0103e48>] show_registers+0x188/0x21c
 [<c0104085>] die+0x1a9/0x283
 [<c0113bb5>] do_page_fault+0x3ed/0x4bf
 [<c03421df>] error_code+0x3f/0x44
 [<f8846af9>] savagefb_probe_i2c_connector+0x18/0x66 [savagefb]
 [<f884667c>] savagefb_probe+0x484/0x672 [savagefb]
 [<c01f6722>] pci_device_probe+0x3a/0x61
 [<c0269ecb>] really_probe+0x37/0xb0
 [<c0269fbc>] driver_probe_device+0x78/0x84
 [<c026a06a>] __driver_attach+0x38/0x60
 [<c026992a>] bus_for_each_dev+0x42/0x69
 [<c0269df7>] driver_attach+0x16/0x18
 [<c0269491>] bus_add_driver+0x66/0x179
 [<c026a2f7>] driver_register+0x77/0x7c
 [<c01f68bf>] __pci_register_driver+0x5e/0x7e
 [<f882d02e>] savagefb_init+0x2e/0x36 [savagefb]
 [<c0132158>] sys_init_module+0x1274/0x1443
 [<c0102dd8>] syscall_call+0x7/0xb
 =======================
 Code: <ff> 33 ff 53 08 6a 00 ff 33 ff 53 08 c7 45 d4 00 00 00 00 83 c4 10 6a 00 31 ff ff 33 ff 53 04 6a 
 EIP: [<f8831013>] fb_ddc_read+0x13/0x1c4 [fb_ddc] SS:ESP 0068:f7fbed68

Hope this helps,
Jurriaan
-- 
"Besides," she added with a shrug, "strategy and tactics are anathema
to the Apocalypse."
        Steven Erikson - Deadhouse Gates
Debian (Unstable) GNU/Linux 2.6.18-rc4-mm3 4423 bogomips load 0.31
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